IMO, the best ways is through friends. Arrange game/movie nights, picnics, etc, and encourage people to invite their friends. Go with friends to local events, like library or city events, and try to say hi to at least a few new people. Go hiking and chat with others at the destination. Rinse and repeat.

It's hard (esp. if you're an introvert like I am), but that's basically how everyone in my family met their SOs, except one who found their SO later in life through an app. Get outside your comfort zone and meet new people, and eventually you'll meet someone you hit it off with. And IMO, don't focus on their gender, just expand your friend circle and someone will have a friend or sibling of your preferred gender and orientation. Worst case scenario, you meet some interesting people.